Terminal structure for electrical apparatus.



'J. H. ZIMMERMANN. TERMINAL STRUCTURE FOR ELECTRICAL APPARATUS.

APPLICATION FILED NOY. 4, 1905. I

Patented May 11, 1909.

INVENTOR V ATTORNEY WITNESSES: I

UNITE smrnsrarsvr "prions-1 a {OF IN H. ZIMMERMANN, OF AbhlflhOR "i \YHS'llNGllOUSl I ELECTRIC & MANUFACTURING COMPANY, A (.(')RP()R;\T I()X (')l-" PEXNSYLYAh'lA I TERMINAL STRUCTURE FOR ELECTRICAL APPARATUS.

No. 921,063. Specification of Letters Patent. Patented May 11, 1909. Application filed November 4, 1905. Serial No, 285,860. 7 t v To all wlz-o'mitma g concern: minal members 5, which are preferably 5 Be it known that I, JOHN H, ZIMMER- assembled with a pair of insulating plates 6 MANN, a citizen of the United States, and a and 7 before they are )laced in position in resident of -Wilkinsburg, in the-county of the instrument. The platesG and 7 are con- 5 Allegheny and State of Pennsylvania, have structed of hard insulating material. such as invented a new and useful Improvement in fiber. and armrespectively provided with 60 Terminal Structures for Electrical Appatwo sets of similar openings 8 and 9 which ratus, of which the following is a speeificaare so constructed as to fit the inner extion. tremities of the terminal members 5, and

10- My invention relates'to terminal structures when the plates are in their operative posifor electrical apparatus and has s ecial reftions, the plate 6 engages shoulders 10 on 65 erence to such structures as are u apted for the members 5 and fits into recesses 11 that. a use with electrical measuring instruments. are formed in the members, adjacentto the The object of my invention is to provide'a shoulders. I terminal structure that shall be simple and The plates 6 and 7 are provided with holes durable and that shall adequately support a 12 to receive a plurality of binding screws 13 70 plurality of terminal pieces in an inelosing and the openings 8 and-9 so located that casing from which they are suit-ably inwhen the plate 6 has been forced into the resulatcd. i cesses i]. in the terminal members and the In electrical measuring instruments having plate 7 is held in engage-111cm with the plate metallic-inclosing casings, it is desirable to 6. the holes 12 in the two plates are in aline- 75 provide hollow, integral projections for the ment. in this way, the terminal members support and protection of the instrument are rigidlv held in position relative to each terminals. W hen such projections are proother and to the instrument l) the plates (5 vided, it is necessary to securely fasten the and'7 when said plates are fastened in positerminal pieces in position and to insulate tionbetween the main body of the inst-ru- 80.

them from the inclosing casings to avoid ment casing and the terminal casing. The. short-circuiting the instrument leads, and opposite ends of the terminal members 5 ex- 0 enings are preferably provided through tend into the openings 4 in the top wall of the t e casing walls in order to facilitate attachterminal casingand' are insulated therefrom ment. to and detachment from external by a pluralitvot' capbushings H ot'insulating" circuits. material which are 's-rrow-threaded onto the -My invention provides an insulating partiends of the terminal members and it into tion between the interior of the main body said openings, v 35 of the instrument and the terminal casing, In order to prevent removal or gradual which also serves, in combination with a loosening of the cap bushings 14, each of plurality of insulating cap bushings that are them is provided, near its inner end, with :1 attached to the several terminal pieces and flange 15 which is of greater diameter than engage openings in the outer wall oi the easthe opening 4 and fits against the inner face 40 ing to hold the terminal pieces in position. of the top wall. The bushings it"arein the accom anying drawings, Figure 1 further provided with'inuer, annular projecis a view,-partiaily in side elevation and partions 16, which so engage the ends of the tertially in section, of a portion of an instruminal members that after the latter arefas ment equi peel with my invention, and Figs. tened in position by the plates 6 and 7 it is 45 2, 3, 4 and 5 are detail views of the terminal impossible to remove the-caps without dissu port shown in Fig. 1'. membering the terminal structure. efe'rring to the drawings, an electrical The detachable wall 3 ot'the terminal casmeasuring instrument casing l is provided ing' allowsaccess to a plurality of set-screws with a projection 2 which ponstitutes a ter- 17, by means of which conductors from ex- 50 minal casing having a detachable front wall .ternal circuits may be clamped to the ter 3and a plurality ofiopenings 4 in its top minal members. Y 7 wall. The instrument may. be provided, in" A plate 18 of some flexible material, such the usual manner, with a detachable face as felt, is also provided in order to prevent cover and with a plurality of similar terdust from working through the terminal caslateral recesses, and a plates therein that constitute a separating ing into the instrument and is held in position by metal strips 19 which are clamped by thebinding screws 13 on top otthe plate.

Although I have illustrated a specific structure, I desire that variations in size, form and arrangement of details which do not depart from the spirit'of my invention shall be included in its scope. 1

I claim as my invention:

1. The combination with a terminal casing for electrical instruments, of a pluralityf-o'f notched terminal members in said casing, supporting, and insulating means for said members comprising a pair of insulating plates which are located between the interior of the instrument and the terminal casing andone of which engages the notches in said terminal members, and ea bushings at tached to the terminals and tted into openings in the outer Wall of the casing.

2. The combination with a terminal casing for electrical instruments, of a plurality of terminal members located therein having similar lateral recesses, a pair of insulating plates which are fitted to the terminal members to form one Wall of the inclos ing casing and one of which engages the recesses in said terminal members, and a plurality of cap bushings fitted to the terminal members and engaging holes which are located in that wall of the casing which is opposite the insulating plates.

3. In an electrical measuringinstrument, the combination with a projection thereon constituting a terminal casing, a plurality of terminal members in said casing having air of insulating wall between the interior of the instrument and the terminal casing and one of which enga es said terminal member recesses.

4. The combination with a terminal casing, of a plurality ofterminalmembers, and supporting and insulating means comprising insulating plates which form one wall of the casing and one of which engages lateral recesses in said terminal members, and cap bushings of insulating material that are inserted in openings in. the outer wall of the casing. 1 1

5. The combination with an instrument casing having a terminal casing extension provided with a detachable front wall and with a plurality of openings in its top wall, a plurality of terminal members, and means for supporting and insulating said members in said casing comprising insulating cap bushings attached to said terminal members and htted into the openings in the top wall of the casing and a pair of" insulating p ates ht- I ted to said terminal members and constituting a separating wall between the body of the main. casing and the terminal casing and one of which engages recesses in said terminal members.

6. The combination with a terminal casing for electrical instruments, of a plurality of terminal members, and means for insulating and supporting said members in said casing comprising a pair of insulating plates which form a separating wall between the interior of the instrument and the terminal casing and one of which engages notr hes in said ter minal members.

7. The combination with a terminal casing for electrical instruments, of a plurality of terminal members having lateral recesses, and a pair of insulating plates which are fitted to the terminal members to constitute one wall of the casing and one of which engages the recesses in said members.

8. In a terminal casing, the rou'il'iiuation with a substantially c Jlindrical terminal member having a lateral recess and one side flattened near one end, of insulating plates fitted to the terminal member at its flattened end and supported from the casing, one of which engages the lateral recess.

9. In a terminal structure, the combination with a plurality of cylindrical terminal n'iembers having lateral recesses and flattened sides, of insulating plates which are fitted to the terminal membcrs and one of which engages the lateral recesses and insulating-bushings secured to one end of the terminal members.

10. In a terminal casing, the combination with cylindrical terminal members having lateral recesses and flattened sides, of insulating plates secured to the walls of the casin g and fitted to the terminals, one of which engages the lateral recesses, insulatingbushings secured to the terminal members and projecting into holes in the casing walls, and means for securing conductors to either end of the terminal members.

In testimony whereof, I have hereunto subscribed my name this 21st day of October 1905.

JOHN ll. ZHlMERMANN.

Witnesses: 4

C. it. llo'rnwum, 1311mm Hm'ns. 

